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alberto239955
Visitor II
July 15, 2003
Question

vertical blank detect

  • July 15, 2003
  • 1 reply
  • 566 views
Posted on July 15, 2003 at 11:55

vertical blank detect

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    A
    alberto239955Author
    Visitor II
    July 15, 2003
    Posted on July 15, 2003 at 11:55

    I have a little problem in detecting the vertical blank to draw smooth animation. I detect the vsync on the bit 3 of 0x3DA addr, but I need the flip-flop one, located in bit 7 of 0x3C2 controlled by the vertical retrace end register. The problem is that I want to see the change by polling the bit 7 and rearm it with VGA IR bit 4. I made some tries of write to VGA IR but it result in no vsync detection or wrong in-frame detection. Has someone any idea?

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